This using the IEEE standard for radio bands if that wasn’t apparent
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There is a lot of stuff in that range. Digital TV broadcasts, radio astronomy, mobile phones, and many others.
https://www.ntia.doc.gov/files/ntia/publications/2003-allochrt.pdf
With IEEE designation
UHF= 300MHz to 1000 MHz or if you like 0.3 GHz to 1 GHz.
300-300MHz is just a frequency 300MHz, if there no prefix or another prefiz on the fiest it would be 300 Hz or 300kHz
I can find IEEE 521-2019 – IEEE Standard Letter Designations for Radar-Frequency Bands for free online I only found the 2002 version and is range starts at HF 3-30 MHz and VHF 30-300MHz. There might be IEEE bands for the lower frequency of 300 Hz and 300kHz in other standards but I did not find them.
So two errors 30-300 MHz not 300-300 MHz and VHF not UHF, IEEE and ITU agree on HF and VHF, it is at higher frequencies the do not agree.,
The next IEEE band is the L band at 1-2 GHz that directly follows UHF
3000-9999MHz = 3GHz to 9.999GHz is the even higher frequency in the S C and X bands, not between UHF and L
SHF is not a part of the IEEE standard or at least the sources I can find. Super high frequency (SHF) is an ITU designation of 3 GHz to 30 GHz but I can find it as an IEEE destination. 1-2GHz is still ITU UHF, the use 0.3-3GHz not the IEEE 0.3-1 GHz
So you are not using IEEE standards for radio bands but the incorrect frequency of name and mix in some ITU
so there is nothing between IEEE UHF and L band they meat at 1 GHz
Here is IEEE band designations [https://www.microwaves101.com/encyclopedias/frequency-letter-bands](https://www.microwaves101.com/encyclopedias/frequency-letter-bands) notice SHF is not there
So uhm…OP, 1Ghz = 1000MHz, 9999MHz = 9.999GHz. The ITU defines UHF as between 300MHz and 3GHz (3000MHz), and SHF as between 3GHz and 30GHz.
So the simple answer is there is no giant empty block of radio, your maths is just wrong.
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